TC2186 Microchip Technology Inc., TC2186 Datasheet - Page 9

• Manufacturer Part Number: TC2186
• Description: 50 Ma, 100 Ma, And 150 Ma Cmos Ldos With Shutdown And Error Output
• Manufacturer: Microchip Technology Inc.

4.0
The TC2054, TC2055 and TC2186 are precision fixed
output voltage regulators. (If an adjustable version is
desired, refer to the TC1070/TC1071/TC1187 data
sheet (DS21353). Unlike bipolar regulators, the
TC2054, TC2055 and TC2186 supply current does not
increase with load current. In addition, V
stable and within regulation over the entire 0 mA to
maximum output current operating load range.
Figure 4-1 shows a typical application circuit.
regulator is enabled any time the shutdown input
(SHDN) is at or above V
when SHDN is at or below V
trolled by a CMOS logic gate, or I/O port of a microcon-
troller. If the SHDN input is not required, it should be
connected directly to the input supply. While in shut-
down, supply current decreases to 0.05 µA (typical),
V
FIGURE 4-1:
4.1
ERROR is driven low whenever V
regulation by more than -5% (typical). This condition
may be caused by low input voltage, output current
limiting or thermal limiting. The ERROR threshold is 5%
below rated V
put voltage value (e.g. ERROR = V
a 5.0V regulator and 2.85V (typ.) for a 3.0V regulator).
ERROR output operation is shown in Figure 4-2.
Note that ERROR is active when V
inactive when V
As shown in Figure 4-1, ERROR can be used as a
battery low flag or as a processor RESET signal (with
the addition of timing capacitor C
chosen to maintain ERROR below V
RESET input for at least 200 ms to allow time for the
system to stabilize. Pull-up resistor R
V
The ERROR pin sink current is self-limiting to
approximately 18 mA.
© 2006 Microchip Technology Inc.
(to CMOS Logic or Tie
OUT
OUT
Shutdown Control
to V
, V
IN
falls to zero volts, and ERROR is open-circuited.
if unused)
IN
DETAILED DESCRIPTION
BATTERY
ERROR Open-Drain Output
or any other voltage less than (V
1 µF
OUT
OUT
Processor RESET Signal
if ERROR is used as a
regardless of the programmed out-
GND
V
SHDN
C2 Required Only
rises above V
IN
Typical Application Circuit.
(See Text)
TC2054
TC2055
TC2186
IH
, and shutdown (disabled)
ERROR
V
IL
OUT
. SHDN may be con-
2
TH
). R
OL
OUT
IH
by V
at 4.75V (typ.) for
OUT
1
V+
of the processor
1
falls to V
x C
can be tied to
1 µF
C
1MΩ
0.2 µF
C
R
1
2
1
HYS
OUT
falls out of
2
IN
should be
.
V
BATTLOW
remains
or RESET
+ 0.3V).
OUT
TH
, and
The
FIGURE 4-2:
4.2
A 1 µF (min) capacitor from V
The output capacitor should have an effective series
resistance of 0.01Ω. to 5Ω for V
to 5Ω for V
aluminum electrolytic capacitors can be used. (Since
many aluminum electrolytic capacitors freeze at
approximately
recommended for applications operating below -25°C).
When operating from sources other than batteries,
supply-noise rejection and transient response can be
improved by increasing the value of the input and
output capacitors and employing passive filtering
techniques.
4.3
A 1 µF capacitor should be connected from V
if there is more than 10 inches of wire between the
regulator and this AC filter capacitor, or if a battery is
used as the power source. Aluminum electrolytic or
tantalum capacitors can be used (since many
aluminum electrolytic capacitors freeze at approxi-
mately -30°C, solid tantalum are recommended for
applications operating below -25°C). When operating
from sources other than batteries, supply-noise
rejection and transient response can be improved by
increasing the value of the input and output capacitors
and employing passive filtering techniques.
ERROR
V
V
V
OUT
V
TH
OL
IH
TC2054/2055/2186
Output Capacitor
Input Capacitor
OUT
-30°C,
< 2.5V. Ceramic, tantalum and
Error Output Operation.
solid
OUT
OUT
to ground is required.
= 2.5V, and 0.05Ω.
HYSTERESIS (V
tantalums
DS21663C-page 9
IN
to GND
HYS
are
)